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(No Model.)

G. E. GORLISS. STEAM BOILER.

No. 333,833. PatentedJan/f 5,1886.

boiler.

UNTTED STATES PATENT OFFICE.

GEORGE H. OORLISS, OF PROVIDENCE, RHODE ISLAND.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 333,833, dated January5, 1886.

Application filed June 13, 1885. Serial No. 168,595. (No model.)

To all whom it may concern:

Be it known that I, GEORGE H. CoRLIss, a citizen of the United States,residing in the city and county of Providence, in the State of RhodeIsland, have invented a certain new and useful Improvement inSteamBoilers, of which the following is a specification.

The object is to provide efficiently and conveniently for thecirculation of water downward in the narrow space around the furnaces ofboilers having furnaces in their interiors.

I will describe the invention as applied to an upright boiler ofcylindrical form with a corresponding cylindrical furnace and a spacebetween it and the shell or exterior of the I provide a set of tubes,open at each end and ot' sufficient length to extend up vand down nearlyor quite the whole height of the furnace, and secure them in therequired postions to provide for downward circulation in the water leg.In the spaces between and around these tubes the Water moves upward,being largely filled with steam, which is being actively generated bythe heat of the furnace.

The accompanying drawings form a part of this specification, andrepresent what I consider the best means of carrying out the invention.

Figure l is a horizontal section, and Fig. 2 a vertical section, of aboiler having my in vention.

Similar letters of reference indicate corresponding parts in both thefigures.

A is the outer portion or shell, andB the inner portion or furnace. B isthe crown or top of the furnace, and O the ordinary upright tubes whichconvey the gaseous products of combustion upward from the furnace. Allthese parts may be as usual. Each upright tube D is of a diametersomething less than the thickness ofthe water leg or space between A andB, and is cut away at each end to form a securing-lip, d. Each isriveted to the shell A by rivets E, which pass through the lips d, andstands with its upper end somewhat above the crown-sheet B', and itslower end a little above the bottom of the water-leg. The current ofwater forced upward by the volume of steam generated in the water-leg issupplied by a freely-descending series of currents in the several tubesD. Vhilelin the ordinary waterleg the dense water will travel only partway down the leg before returning, my invention insures a thorough andcomplete circulation of the water clear to the bottomof the leg, andtends thereby to keep the leg free from the deposit of sediment.

Modifications may be made in the forms and proportions.

The tubes D may be of less thickness, and may be held by smaller rivetsthan shown. A greater or less number may suffice. They may bedistributed irregularly, if preferred in any case.

I claim as my invention- In ast-eam-boiler having an internal furnace, aseries of tubes, as D D, extending up and down in the space between thefurnace and shell, open at each end and out away to form lips d, thetube D being secured to the shell A by fastenings E, which pass throughsaid lips7 all arranged for joint operation substantially as hereinspecified.

In testimony whereof I have hereunto set my hand, at Providence, RhodeIsland, this 2d day of June, 1885, in the presence of two subscribingwitnesses.

GEORGE H. CORLISS.

`Viitnesses:

HENRY MARSH, Jr., WILLIAM B. SHERMAN.

